> how do we replace failed bolts Use that gray stuff in your head to think of a way to do it. It depends on the type and grade of bolt and how it's holding the

> how do we replace failed bolts Use that gray stuff in your head to think of a way to do it. It depends on the type and grade of bolt and how it's holding the things together. You could broach & thread the hole and replace your broken bolt with a larger bolt. Then you can collect your metals, melt them down, work the metal with some oils to imbue it with some carbon, and make reclaimed bolts. With power, a lathe, and time you can build anything round. With some more tools you can build anything of any shape. Just recycle everything.